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package Test2::API::Instance;
use strict;
use warnings;

our $VERSION = '1.302135';

our @CARP_NOT = qw/Test2::API Test2::API::Instance Test2::IPC::Driver Test2::Formatter/;
use Carp qw/confess carp/;
use Scalar::Util qw/reftype/;

use Test2::Util qw/get_tid USE_THREADS CAN_FORK pkg_to_file try CAN_SIGSYS/;

use Test2::EventFacet::Trace();
use Test2::API::Stack();

use Test2::Util::HashBase qw{
    _pid _tid
    no_wait
    finalized loaded
    ipc stack formatter
    contexts

add_uuid_via

-preload

ipc_disabled
    ipc_shm_size
    ipc_shm_last
    ipc_shm_id
    ipc_polling
    ipc_drivers
    ipc_timeout
    formatters

exit_callbacks
    post_load_callbacks
    context_acquire_callbacks
    context_init_callbacks
    context_release_callbacks
    pre_subtest_callbacks
};

sub DEFAULT_IPC_TIMEOUT() { 30 }

sub pid { $_[0]->{+_PID} }
sub tid { $_[0]->{+_TID} }

# Wrap around the getters that should call _finalize.
BEGIN {
    for my $finalizer (IPC, FORMATTER) {
        my $orig = __PACKAGE__->can($finalizer);
        my $new  = sub {
            my $self = shift;
            $self->_finalize unless $self->{+FINALIZED};
            $self->$orig;
        };

no strict 'refs';
        no warnings 'redefine';
        *{$finalizer} = $new;
    }
}

sub has_ipc { !!$_[0]->{+IPC} }

sub import {
    my $class = shift;
    return unless @_;
    my ($ref) = @_;
    $$ref = $class->new;
}

sub init { $_[0]->reset }

sub start_preload {
    my $self = shift;

confess "preload cannot be started, Test2::API has already been initialized"
        if $self->{+FINALIZED} || $self->{+LOADED};

return $self->{+PRELOAD} = 1;
}

sub stop_preload {
    my $self = shift;

return 0 unless $self->{+PRELOAD};
    $self->{+PRELOAD} = 0;

$self->post_preload_reset();

return 1;
}

sub post_preload_reset {
    my $self = shift;

delete $self->{+_PID};
    delete $self->{+_TID};

$self->{+ADD_UUID_VIA} = undef unless exists $self->{+ADD_UUID_VIA};

$self->{+CONTEXTS} = {};

$self->{+FORMATTERS} = [];

$self->{+FINALIZED} = undef;
    $self->{+IPC}       = undef;
    $self->{+IPC_DISABLED} = $ENV{T2_NO_IPC} ? 1 : 0;

$self->{+IPC_TIMEOUT} = DEFAULT_IPC_TIMEOUT() unless defined $self->{+IPC_TIMEOUT};

$self->{+LOADED} = 0;

$self->{+STACK} ||= Test2::API::Stack->new;
}

sub reset {
    my $self = shift;

delete $self->{+_PID};
    delete $self->{+_TID};

$self->{+ADD_UUID_VIA} = undef;

$self->{+CONTEXTS} = {};

$self->{+IPC_DRIVERS} = [];
    $self->{+IPC_POLLING} = undef;

$self->{+FORMATTERS} = [];
    $self->{+FORMATTER}  = undef;

$self->{+FINALIZED}    = undef;
    $self->{+IPC}          = undef;
    $self->{+IPC_DISABLED} = $ENV{T2_NO_IPC} ? 1 : 0;

$self->{+IPC_TIMEOUT} = DEFAULT_IPC_TIMEOUT() unless defined $self->{+IPC_TIMEOUT};

$self->{+NO_WAIT} = 0;
    $self->{+LOADED}  = 0;

$self->{+EXIT_CALLBACKS}            = [];
    $self->{+POST_LOAD_CALLBACKS}       = [];
    $self->{+CONTEXT_ACQUIRE_CALLBACKS} = [];
    $self->{+CONTEXT_INIT_CALLBACKS}    = [];
    $self->{+CONTEXT_RELEASE_CALLBACKS} = [];
    $self->{+PRE_SUBTEST_CALLBACKS}     = [];

$self->{+STACK} = Test2::API::Stack->new;
}

sub _finalize {
    my $self = shift;
    my ($caller) = @_;
    $caller ||= [caller(1)];

confess "Attempt to initialize Test2::API during preload"
        if $self->{+PRELOAD};

$self->{+FINALIZED} = $caller;

$self->{+_PID} = $$        unless defined $self->{+_PID};
    $self->{+_TID} = get_tid() unless defined $self->{+_TID};

unless ($self->{+FORMATTER}) {
        my ($formatter, $source);
        if ($ENV{T2_FORMATTER}) {
            $source = "set by the 'T2_FORMATTER' environment variable";

if ($ENV{T2_FORMATTER} =~ m/^(\+)?(.*)$/) {
                $formatter = $1 ? $2 : "Test2::Formatter::$2"
            }
            else {
                $formatter = '';
            }
        }
        elsif (@{$self->{+FORMATTERS}}) {
            ($formatter) = @{$self->{+FORMATTERS}};
            $source = "Most recently added";
        }
        else {
            $formatter = 'Test2::Formatter::TAP';
            $source    = 'default formatter';
        }

unless (ref($formatter) || $formatter->can('write')) {
            my $file = pkg_to_file($formatter);
            my ($ok, $err) = try { require $file };
            unless ($ok) {
                my $line   = "* COULD NOT LOAD FORMATTER '$formatter' ($source) *";
                my $border = '*' x length($line);
                die "\n\n  $border\n  $line\n  $border\n\n$err";
            }
        }

$self->{+FORMATTER} = $formatter;
    }

# Turn on IPC if threads are on, drivers are registered, or the Test2::IPC
    # module is loaded.
    return if $self->{+IPC_DISABLED};
    return unless USE_THREADS || $INC{'Test2/IPC.pm'} || @{$self->{+IPC_DRIVERS}};

# Turn on polling by default, people expect it.
    $self->enable_ipc_polling;

unless (@{$self->{+IPC_DRIVERS}}) {
        my ($ok, $error) = try { require Test2::IPC::Driver::Files };
        die $error unless $ok;
        push @{$self->{+IPC_DRIVERS}} => 'Test2::IPC::Driver::Files';
    }

for my $driver (@{$self->{+IPC_DRIVERS}}) {
        next unless $driver->can('is_viable') && $driver->is_viable;
        $self->{+IPC} = $driver->new or next;
        $self->ipc_enable_shm if $self->{+IPC}->use_shm;
        return;
    }

die "IPC has been requested, but no viable drivers were found. Aborting...\n";
}

sub formatter_set { $_[0]->{+FORMATTER} ? 1 : 0 }

sub add_formatter {
    my $self = shift;
    my ($formatter) = @_;
    unshift @{$self->{+FORMATTERS}} => $formatter;

return unless $self->{+FINALIZED};

# Why is the @CARP_NOT entry not enough?
    local %Carp::Internal = %Carp::Internal;
    $Carp::Internal{'Test2::Formatter'} = 1;

carp "Formatter $formatter loaded too late to be used as the global formatter";
}

sub add_context_acquire_callback {
    my $self =  shift;
    my ($code) = @_;